Digital Images
Digital images are pictures stored as numbers that a computer can use to show the picture on a screen or print it out. 🖼️
簡要介紹
Digital images are everywhere! They are how we see photos on our phones, computers, and even some billboards. Instead of being made of ink or paint, digital images are made of tiny squares, kind of like a mosaic, that a computer understands and shows us. This allows us to easily share and edit photos and artwork. ✨
主要說明
Made of Pixels
Imagine a mosaic made of tiny colored tiles. A digital image is similar! Each tiny square is called a 'pixel,' short for 'picture element.' Each pixel has a specific color. When you put millions of these colored pixels together, you get a complete picture. 🟦 🟥 🟩 Think of zooming in really close on a photo on your phone – you'll start to see those individual pixel squares.
Numbers Represent Colors
Each pixel's color is described by a number (or a set of numbers). These numbers tell the computer exactly what shade of red, green, and blue to mix to create that pixel's color. 🎨 For example, a pixel might have the numbers 255, 0, 0, which means it's pure red. The computer reads these numbers and lights up that pixel with the correct color.
Resolution Matters
Resolution refers to the number of pixels in an image, usually expressed as width x height (e.g., 1920x1080). A higher resolution means more pixels, which results in a sharper and more detailed image. 📸 Think of it like having more tiny tiles to create a more intricate mosaic. A low-resolution image will look blurry or 'pixelated' because it has fewer pixels.
Different File Formats
Digital images are stored in different file formats, such as JPEG, PNG, and GIF. Each format has its own way of compressing the image data, which affects the image quality and file size. 💾 JPEG is great for photos because it compresses well, making the file size smaller. PNG is better for images with text or graphics, as it preserves sharp lines. GIF is commonly used for animated images.
範例
- Think of a digital photograph like a knitted blanket. Each stitch is like a pixel. A blanket with lots of tiny, closely spaced stitches will have a clearer pattern than one with large, loose stitches. 🧶
- Imagine drawing a picture on graph paper. Each square on the graph paper is a pixel. You color in the squares to create the picture. The more squares you have, the more detailed your picture can be. ✍️
- Consider a digital painting. Instead of mixing paints on a palette, the artist uses software to select colors and 'paint' individual pixels on the screen. The computer stores the color information for each pixel, creating the final image. 🖥️
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